- 30 - 
conditions, set fair crops when -planted alone. 
One tree is considered sufficient to polliniae eight others 
if bees are provided to carry the pollen . 
Tufts, W. P., and Philp, G. L. 
1923. Pear pollination. Calif. Agr. Expt. Sta. Bui, 373, 36 pp. 
p. 35 i Pear fruits resulting from cross-pollination do not 
appear to exhibit the same tendency to fall after the June drop . 
as do those resulting from self-pollination. 
Pollinating agencies such as honey bees are necessary to set 
a good crop of fruit. 
Persimmon, Native 
Fletcher, W. F. 
1942. The native persimmon. U. S. Dept. Agr. Farmers 1 Bui. 685, 
22 pp. 
pp. 3-4 1 The trees are generally dioecious,* that is, the 
pollen-bearing and fruit- producing flowers are borne on separate 
trees. The pistillate or fruit-producing flowers are borne singly, 
whereas the staminate or pollen-bearing flowers are generally pro- 
duced in threes. The pollen is very light and powdery, and, although 
it is generally distributed by bees that frequent the trees in great 
numbers during blossoming time, it can also be carried to great 
distances by the wind. 
Plum and Prune 
Hendrickson, A. H. 
1918. The conanon honey bee as an agent in prune pollination. Calif. 
Agr. Expt. Sta. Bui. 291, pp. 215-236. 
p. 236: The results of the two seasons' work seem to warrant 
the following conclusions: Both the French and Imperial prunes may 
be aided in setting fruit by the use of bees in the orchard during 
the blossoming period, provided the trees are in a normal, healthy 
condition. 
The absence of bees in the orchard may mean a low percentage of 
set with both of these varieties . 
Hendrickson, A. H. 
1922. Further experiments in plum pollination. Calif. Agr. Expt. 
Sta. Bui. 352, pp. 247-266* 
